I just don't understand....

*rubs her tired eyes* why some mornings I can't seem to pull myself out of bed and others I'm wide awake and unable to sleep. It doesn't even depend on when I go to sleep at night. My body is telling me I'm tired, but after laying in bed for over an hour wide awake, I got up this morning, did the dishes and ate breakfast. Now I am going to tackle a pile of school work before church..but I'd rather be sleeping :( Ah well. I guess this is a good thing.